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1Drastic change in dynamics as Typhoon Lekima experiences an eyewall replacement cycle显示文摘Why does the 1909 typhoon,Lekima,become so destructive after making landfall in China?Using a newly developed mathematical apparatus,the multiscale window transform(MWT),and the MWT-based localized mutliscale energetics analysis and theory of canonical transfer,this study is intended to give a partial answer from a dynamical point of view.The ECMWF reanalysis fields are first reconstructed onto the background window,the TC-scale window,and the convection-scale window.A localized energetics analysis is then performed,which reveals to us distinctly different scenarios before and after August 8–9,2019,when an eyewall replacement cycle takes place.Before that,the energy supply in the upper layer is mainly via a strong upper layer-limited baroclinic instability;the available potential energy thus-gained is then converted into the TC-scale kinetic energy,with a portion to fuel Lekima’s upper part,another portion carried downward via pressure work flux to maintain the cyclone’s lower part.After the eyewall replacement cycle,a drastic change in dynamics occurs.First,the pressure work is greatly increased in magnitude.A positive baroclinic transfer almost spreads throughout the troposphere,and so does barotropic transfer;in other words,the whole air column is now both barotropically and baroclinically unstable.These newly occurred instabilities help compensate the increasing consumption of the TC-scale kinetic energy,and hence help counteract the dissipation of Lekima after making landfalls.Fen XU X.San LIANG 2022Frontiers of Earth Science2022,16,1:1
2南京信息工程大学气候与气候变化研究进展回顾显示文摘简要回顾了南京信息工程大学建校60 a来在气候与气候变化方向的研究历程,总结了南京信息工程大学(简称南信大)气候学科在辐射气候、山地气候、应用气候、气候诊断与预测、统计气候、气候变化与区域响应及其未来预估等方面的重要研究成果。江志红 翁笃鸣 屠其璞 缪启龙 吴息 余锦华 2020大气科学学报2020,43,5:0
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